<!DOCTYPE html>
<html>

<head>
  <style>
    button {
      height: 30px;
      width: 30px;
      outline: none;
    }
  </style>
</head>

<body>
  <button id="changeColor"></button>
  <button id="originColor"></button>
  <script src="../js/popup.js"></script>
</body>

</html>